How to write an "Echo Server"?

[zsdz]

Sample 8 can enable the usbkeyboard,and echo the typed letter on screen

I want to write an "Echo Server",when user typed a line,the server will echo the while line,so I change the sample 8 code:

 void CKernel::KeyPressedHandler (const char *pString)
 {
     s_pThis->m_Screen.Write (pString, strlen (pString));

    if(pString[0]!='\n')
    {
	    strcat(s_pThis->s,pString);
    }
    else
    {
	    strcat(s_pThis->s,pString);
            s_pThis->m_Screen.Write (s_pThis->s, strlen (s_pThis->s));
	    strcpy(s_pThis->s,"");
    }
}

and add

strcpy(s_pThis->s,"");

in function

boolean CKernel::Initialize (void)

before

return bOK;

if got key not equal '\n',strcat it,else write it on screen and clear the buffer.

the prog works fine,but I write it in the call-back function KeyPressedHandler.I want write the logic in the "main function",in circle it should be the

TShutdownMode CKernel::Run (void)

function,like write

 scanf(line)
 printf(line)

in c,I can write it in the main function.After all I can't always put the logic code in the call-back function

How to do this?Thanks!